<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>数据代理</title>
</head>
<body>
    <script>
        let obj1 = { x: 100 }
        let obj2 = { y: 200 }

        // 通过obj2来操作obj1
        Object.defineProperty(obj2, "x", {
            get() {
                return obj1.x
            },

            set(value) {
                obj1.x = value
            }
        })
    </script>
</body>
</html>